Impact wrenches are the true workhorses of industrial power tools.These incredibly powerful tools make easy work of any job in a varietyof applications. Before the creation of impact tools, workers had tomanually strike a hammer against a hand wrench in order to loosen ortighten nuts or bolts. They could only manage a few blows per minute.But today’s impact wrenches can exert more powerful blows, andsome can produce up to 1,200 blows per minute. This isaccomplished by using the energy of compressed air andconverting the motor’s torque into a rapid series of powerfulrotary impacts.